The poorer result for the Gtk2-1.24993 tests that I get with Strawberry Perl is entirely due to the fact that perl/site/lib/Gtk2/Gdk/Keysyms.pm is generated as an empty file on Strawberry.
When I replace that empty file with the correctly generated Keysyms.pm that my own build of perl-5.38.0 created, then I get identical results of "5/227 failing test programs", not "11/227 failing test programs.
I tried to put the contents of that Keysyms.pm on my scratchpad, but it's too big for perlmonks to accommodate.
If anyone wants a copy of it just /msg me with an email address I can post it to.

I don't know why Strawberry doesn't provide the same Keysyms.pm. (I've got some notes on my Windows 7 machine from 5 years ago that inform me that the same thing happened back then, too.)

I've also got some old notes stating that installing Font::FreeType improves the capabilities of Cairo.
I was going to try that out, but Devel::CheckLib is a prereq, and I'm not up to dealing with that annoying hoop tonight.

<UPDATE>
I've now (approx 24 hours later) built and installed Font-FreeType-0.16. It builds and tests fine, but doesn't change anything AFAICS. To build Font-FreeType, I replaced the Makefile.PL that ships with the distro with: 
use strict;
use warnings;
use ExtUtils::MakeMaker;

WriteMakefile(
    NAME               => 'Font::FreeType',
    AUTHOR             => 'Geoff Richards <qef@laxan.com>',
    VERSION_FROM       => 'lib/Font/FreeType.pm',
    LIBS => '-LD:/msys64/mingw64/lib -lfreetype',
    INC  => '-ID:/msys64/mingw64/include/freetype2',
);

[download]
</UPDATE>

I've yet to work out why Gtk3 is so broken on the Strawberry build.
The (fairly fundamental) problem is that the following runs fine on my own build of perl-5.38.0: 
D:\>perl -MGtk3 -wle "my ($success, $rest) = Glib::Object::Introspecti
+on->invoke ('Gtk', undef, 'init_check', [$0, @ARGV]); print 'ok';"
ok

[download]
But on Strawberry's 5.38.0, running the same command, I get: 
D:\>perl -MGtk3 -wle "my ($success, $rest) = Glib::Object::Introspecti
+on->invoke ('Gtk', undef, 'init_check', [$0, @ARGV]); print 'ok'"
Could not prepare a call interface at -e line 1.

[download]
Looks like the problem lies with the Glib-Object-Introspection module.

Cheers,
Rob

In reply to Re^6: gmake error on Glib compile by syphilis
in thread gmake error on Glib compile by MikeMc69

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